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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb3630ebcdba191f4ac0445bc5a99b9dc4b10f07c6c7358a95feb965071713f' 
  AND token = 'c4rmNAiO00eRKO8vKhN1VucJueJ6tTVuJ94FpUI5dEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}